[Bug 3511806] Compiler checks too early

This change allows to build the cygwin
and mingw32 ports of Tcl/Tk to build
out-of-the-box using a native or cross-
compiler

3 files changed, 604 insertions, 507 deletions

diff --git a/win/configure b/win/configure
index a649b9f..6f6ef8e 100755
--- a/win/configure
+++ b/win/configure
@@ -937,16 +937,40 @@ fi
 
 
 #--------------------------------------------------------------------
-# Perform additinal compiler tests.
+# Determines the correct binary file extension (.o, .obj, .exe etc.)
 #--------------------------------------------------------------------
 
+echo $ac_n "checking for object suffix""... $ac_c" 1>&6
+echo "configure:945: checking for object suffix" >&5
+if eval "test \"`echo '$''{'ac_cv_objext'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  rm -f conftest*
+echo 'int i = 1;' > conftest.$ac_ext
+if { (eval echo configure:951: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+  for ac_file in conftest.*; do
+    case $ac_file in
+    *.c) ;;
+    *) ac_cv_objext=`echo $ac_file | sed -e s/conftest.//` ;;
+    esac
+  done
+else
+  { echo "configure: error: installation or configuration problem; compiler does not work" 1>&2; exit 1; }
+fi
+rm -f conftest*
+fi
+
+echo "$ac_t""$ac_cv_objext" 1>&6
+OBJEXT=$ac_cv_objext
+ac_objext=$ac_cv_objext
+
 echo $ac_n "checking for Cygwin environment""... $ac_c" 1>&6
-echo "configure:945: checking for Cygwin environment" >&5
+echo "configure:969: checking for Cygwin environment" >&5
 if eval "test \"`echo '$''{'ac_cv_cygwin'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 950 "configure"
+#line 974 "configure"
 #include "confdefs.h"
 
 int main() {
@@ -957,7 +981,7 @@ int main() {
 return __CYGWIN__;
 ; return 0; }
 EOF
-if { (eval echo configure:961: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:985: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_cygwin=yes
 else
@@ -973,331 +997,20 @@ fi
 echo "$ac_t""$ac_cv_cygwin" 1>&6
 CYGWIN=
 test "$ac_cv_cygwin" = yes && CYGWIN=yes
-
-echo $ac_n "checking for SEH support in compiler""... $ac_c" 1>&6
-echo "configure:979: checking for SEH support in compiler" >&5
-if eval "test \"`echo '$''{'tcl_cv_seh'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&6
-else
-  if test "$cross_compiling" = yes; then
-  tcl_cv_seh=no
-else
-  cat > conftest.$ac_ext <<EOF
-#line 987 "configure"
-#include "confdefs.h"
-
-#define WIN32_LEAN_AND_MEAN
-#include <windows.h>
-#undef WIN32_LEAN_AND_MEAN
-
-int main(int argc, char** argv) {
-    int a, b = 0;
-    __try {
-        a = 666 / b;
-    }
-    __except (EXCEPTION_EXECUTE_HANDLER) {
-        return 0;
-    }
-    return 1;
-}
-
-EOF
-if { (eval echo configure:1006: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
-then
-  tcl_cv_seh=yes
-else
-  echo "configure: failed program was:" >&5
-  cat conftest.$ac_ext >&5
-  rm -fr conftest*
-  tcl_cv_seh=no
-fi
-rm -fr conftest*
-fi
-
-
-fi
-
-echo "$ac_t""$tcl_cv_seh" 1>&6
-if test "$tcl_cv_seh" = "no" ; then
-    cat >> confdefs.h <<\EOF
-#define HAVE_NO_SEH 1
-EOF
-
-fi
-
-#
-# Check to see if the excpt.h include file provided contains the
-# definition for EXCEPTION_DISPOSITION; if not, which is the case
-# with Cygwin's version as of 2002-04-10, define it to be int,
-# sufficient for getting the current code to work.
-#
-echo $ac_n "checking for EXCEPTION_DISPOSITION support in include files""... $ac_c" 1>&6
-echo "configure:1036: checking for EXCEPTION_DISPOSITION support in include files" >&5
-if eval "test \"`echo '$''{'tcl_cv_eh_disposition'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&6
-else
-  cat > conftest.$ac_ext <<EOF
-#line 1041 "configure"
-#include "confdefs.h"
-
-#define WIN32_LEAN_AND_MEAN
-#include <windows.h>
-#undef WIN32_LEAN_AND_MEAN
-
-int main() {
-
-  EXCEPTION_DISPOSITION x;
-
-; return 0; }
-EOF
-if { (eval echo configure:1054: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
-  rm -rf conftest*
-  tcl_cv_eh_disposition=yes
-else
-  echo "configure: failed program was:" >&5
-  cat conftest.$ac_ext >&5
-  rm -rf conftest*
-  tcl_cv_eh_disposition=no
-fi
-rm -f conftest*
-
-fi
-
-echo "$ac_t""$tcl_cv_eh_disposition" 1>&6
-if test "$tcl_cv_eh_disposition" = "no" ; then
-    cat >> confdefs.h <<\EOF
-#define EXCEPTION_DISPOSITION int
-EOF
-
-fi
-
-
-# Check to see if the winsock2.h include file provided contains
-# typedefs like LPFN_ACCEPT and friends.
-#
-echo $ac_n "checking for LPFN_ACCEPT support in winsock2.h""... $ac_c" 1>&6
-echo "configure:1080: checking for LPFN_ACCEPT support in winsock2.h" >&5
-if eval "test \"`echo '$''{'tcl_cv_lpfn_decls'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&6
-else
-  cat > conftest.$ac_ext <<EOF
-#line 1085 "configure"
-#include "confdefs.h"
-
-#define WIN32_LEAN_AND_MEAN
-#include <windows.h>
-#undef WIN32_LEAN_AND_MEAN
-#include <winsock2.h>
-
-int main() {
-
-  LPFN_ACCEPT accept;
-
-; return 0; }
-EOF
-if { (eval echo configure:1099: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
-  rm -rf conftest*
-  tcl_cv_lpfn_decls=yes
-else
-  echo "configure: failed program was:" >&5
-  cat conftest.$ac_ext >&5
-  rm -rf conftest*
-  tcl_cv_lpfn_decls=no
-fi
-rm -f conftest*
-
-fi
-
-echo "$ac_t""$tcl_cv_lpfn_decls" 1>&6
-if test "$tcl_cv_lpfn_decls" = "no" ; then
-    cat >> confdefs.h <<\EOF
-#define HAVE_NO_LPFN_DECLS 1
-EOF
-
-fi
-
-# Check to see if winnt.h defines CHAR, SHORT, and LONG
-# even if VOID has already been #defined. The win32api
-# used by mingw and cygwin is known to do this.
-
-echo $ac_n "checking for winnt.h that ignores VOID define""... $ac_c" 1>&6
-echo "configure:1125: checking for winnt.h that ignores VOID define" >&5
-if eval "test \"`echo '$''{'tcl_cv_winnt_ignore_void'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&6
-else
-  cat > conftest.$ac_ext <<EOF
-#line 1130 "configure"
-#include "confdefs.h"
-
-#define VOID void
-#define WIN32_LEAN_AND_MEAN
-#include <windows.h>
-#undef WIN32_LEAN_AND_MEAN
-
-int main() {
-
-  CHAR c;
-  SHORT s;
-  LONG l;
-
-; return 0; }
-EOF
-if { (eval echo configure:1146: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
-  rm -rf conftest*
-  tcl_cv_winnt_ignore_void=yes
-else
-  echo "configure: failed program was:" >&5
-  cat conftest.$ac_ext >&5
-  rm -rf conftest*
-  tcl_cv_winnt_ignore_void=no
-fi
-rm -f conftest*
-
-fi
-
-echo "$ac_t""$tcl_cv_winnt_ignore_void" 1>&6
-if test "$tcl_cv_winnt_ignore_void" = "yes" ; then
-    cat >> confdefs.h <<\EOF
-#define HAVE_WINNT_IGNORE_VOID 1
-EOF
-
-fi
-
-# Check to see if malloc.h is missing the alloca function
-# declaration. This is known to be a problem with Mingw.
-# If we compiled without the function declaration, it
-# would work but we would get a warning message from gcc.
-# If we add the function declaration ourselves, it
-# would not compile correctly because the _alloca
-# function expects the argument to be passed in a
-# register and not on the stack. Instead, we just
-# call it from inline asm code.
-
-echo $ac_n "checking for alloca declaration in malloc.h""... $ac_c" 1>&6
-echo "configure:1178: checking for alloca declaration in malloc.h" >&5
-if eval "test \"`echo '$''{'tcl_cv_malloc_decl_alloca'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&6
-else
-  cat > conftest.$ac_ext <<EOF
-#line 1183 "configure"
-#include "confdefs.h"
-
-#include <malloc.h>
-
-int main() {
-
-  size_t arg = 0;
-  void* ptr;
-  ptr = alloca;
-  ptr = alloca(arg);
-
-; return 0; }
-EOF
-if { (eval echo configure:1197: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
-  rm -rf conftest*
-  tcl_cv_malloc_decl_alloca=yes
-else
-  echo "configure: failed program was:" >&5
-  cat conftest.$ac_ext >&5
-  rm -rf conftest*
-  tcl_cv_malloc_decl_alloca=no
-fi
-rm -f conftest*
-
-fi
-
-echo "$ac_t""$tcl_cv_malloc_decl_alloca" 1>&6
-if test "$tcl_cv_malloc_decl_alloca" = "no" &&
-   test "${GCC}" = "yes" ; then
-    cat >> confdefs.h <<\EOF
-#define HAVE_ALLOCA_GCC_INLINE 1
-EOF
-
-fi
-
-# See if the compiler supports casting to a union type.
-# This is used to stop gcc from printing a compiler
-# warning when initializing a union member.
-
-echo $ac_n "checking for cast to union support""... $ac_c" 1>&6
-echo "configure:1224: checking for cast to union support" >&5
-if eval "test \"`echo '$''{'tcl_cv_cast_to_union'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&6
-else
-  cat > conftest.$ac_ext <<EOF
-#line 1229 "configure"
-#include "confdefs.h"
-
-int main() {
-
-  union foo { int i; double d; };
-  union foo f = (union foo) (int) 0;
-
-; return 0; }
-EOF
-if { (eval echo configure:1239: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
-  rm -rf conftest*
-  tcl_cv_cast_to_union=yes
-else
-  echo "configure: failed program was:" >&5
-  cat conftest.$ac_ext >&5
-  rm -rf conftest*
-  tcl_cv_cast_to_union=no
-fi
-rm -f conftest*
-
-fi
-
-echo "$ac_t""$tcl_cv_cast_to_union" 1>&6
-if test "$tcl_cv_cast_to_union" = "yes"; then
-    cat >> confdefs.h <<\EOF
-#define HAVE_CAST_TO_UNION 1
-EOF
-
-fi
-
-#--------------------------------------------------------------------
-# Determines the correct binary file extension (.o, .obj, .exe etc.)
-#--------------------------------------------------------------------
-
-echo $ac_n "checking for object suffix""... $ac_c" 1>&6
-echo "configure:1265: checking for object suffix" >&5
-if eval "test \"`echo '$''{'ac_cv_objext'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&6
-else
-  rm -f conftest*
-echo 'int i = 1;' > conftest.$ac_ext
-if { (eval echo configure:1271: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
-  for ac_file in conftest.*; do
-    case $ac_file in
-    *.c) ;;
-    *) ac_cv_objext=`echo $ac_file | sed -e s/conftest.//` ;;
-    esac
-  done
-else
-  { echo "configure: error: installation or configuration problem; compiler does not work" 1>&2; exit 1; }
-fi
-rm -f conftest*
-fi
-
-echo "$ac_t""$ac_cv_objext" 1>&6
-OBJEXT=$ac_cv_objext
-ac_objext=$ac_cv_objext
-
 echo $ac_n "checking for mingw32 environment""... $ac_c" 1>&6
-echo "configure:1289: checking for mingw32 environment" >&5
+echo "configure:1002: checking for mingw32 environment" >&5
 if eval "test \"`echo '$''{'ac_cv_mingw32'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 1294 "configure"
+#line 1007 "configure"
 #include "confdefs.h"
 
 int main() {
 return __MINGW32__;
 ; return 0; }
 EOF
-if { (eval echo configure:1301: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:1014: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_mingw32=yes
 else
@@ -1316,7 +1029,7 @@ test "$ac_cv_mingw32" = yes && MINGW32=yes
 
 
 echo $ac_n "checking for executable suffix""... $ac_c" 1>&6
-echo "configure:1320: checking for executable suffix" >&5
+echo "configure:1033: checking for executable suffix" >&5
 if eval "test \"`echo '$''{'ac_cv_exeext'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1326,7 +1039,7 @@ else
   rm -f conftest*
   echo 'int main () { return 0; }' > conftest.$ac_ext
   ac_cv_exeext=
-  if { (eval echo configure:1330: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
+  if { (eval echo configure:1043: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
     for file in conftest.*; do
       case $file in
       *.c | *.o | *.obj) ;;
@@ -1353,7 +1066,7 @@ ac_exeext=$EXEEXT
 
 
     echo $ac_n "checking for building with threads""... $ac_c" 1>&6
-echo "configure:1357: checking for building with threads" >&5
+echo "configure:1070: checking for building with threads" >&5
     # Check whether --enable-threads or --disable-threads was given.
 if test "${enable_threads+set}" = set; then
   enableval="$enable_threads"
@@ -1390,7 +1103,7 @@ EOF
 
 
     echo $ac_n "checking how to build libraries""... $ac_c" 1>&6
-echo "configure:1394: checking how to build libraries" >&5
+echo "configure:1107: checking how to build libraries" >&5
     # Check whether --enable-shared or --disable-shared was given.
 if test "${enable_shared+set}" = set; then
   enableval="$enable_shared"
@@ -1431,7 +1144,7 @@ EOF
     # Step 0: Enable 64 bit support?
 
     echo $ac_n "checking if 64bit support is requested""... $ac_c" 1>&6
-echo "configure:1435: checking if 64bit support is requested" >&5
+echo "configure:1148: checking if 64bit support is requested" >&5
     # Check whether --enable-64bit or --disable-64bit was given.
 if test "${enable_64bit+set}" = set; then
   enableval="$enable_64bit"
@@ -1445,7 +1158,7 @@ fi
     # Cross-compiling options for Windows/CE builds
 
     echo $ac_n "checking if Windows/CE build is requested""... $ac_c" 1>&6
-echo "configure:1449: checking if Windows/CE build is requested" >&5
+echo "configure:1162: checking if Windows/CE build is requested" >&5
     # Check whether --enable-wince or --disable-wince was given.
 if test "${enable_wince+set}" = set; then
   enableval="$enable_wince"
@@ -1457,7 +1170,7 @@ fi
     echo "$ac_t""$doWince" 1>&6
 
     echo $ac_n "checking for Windows/CE celib directory""... $ac_c" 1>&6
-echo "configure:1461: checking for Windows/CE celib directory" >&5
+echo "configure:1174: checking for Windows/CE celib directory" >&5
     # Check whether --with-celib or --without-celib was given.
 if test "${with_celib+set}" = set; then
   withval="$with_celib"
@@ -1474,7 +1187,7 @@ fi
     # Extract the first word of "cygpath", so it can be a program name with args.
 set dummy cygpath; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:1478: checking for $ac_word" >&5
+echo "configure:1191: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_CYGPATH'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1508,6 +1221,57 @@ fi
     # which requires x86|amd64|ia64.
     MACHINE="X86"
 
+    echo $ac_n "checking for cross-compile version of gcc""... $ac_c" 1>&6
+echo "configure:1226: checking for cross-compile version of gcc" >&5
+if eval "test \"`echo '$''{'ac_cv_cross'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.$ac_ext <<EOF
+#line 1231 "configure"
+#include "confdefs.h"
+
+	    #ifdef __WIN32__
+		#error cross-compiler
+	    #endif
+	
+int main() {
+
+; return 0; }
+EOF
+if { (eval echo configure:1242: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+  rm -rf conftest*
+  ac_cv_cross=yes
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  ac_cv_cross=no
+fi
+rm -f conftest*
+    
+fi
+
+echo "$ac_t""$ac_cv_cross" 1>&6
+
+    if test "$ac_cv_cross" = "yes"; then
+	case "$do64bit" in
+	    amd64|x64|yes)
+		CC="x86_64-w64-mingw32-gcc"
+		LD="x86_64-w64-mingw32-ld"
+		AR="x86_64-w64-mingw32-ar"
+		RANLIB="x86_64-w64-mingw32-ranlib"
+		RC="x86_64-w64-mingw32-windres"
+	    ;;
+	    *)
+		CC="i686-w64-mingw32-gcc"
+		LD="i686-w64-mingw32-ld"
+		AR="i686-w64-mingw32-ar"
+		RANLIB="i686-w64-mingw32-ranlib"
+		RC="i686-w64-mingw32-windres"
+	    ;;
+	esac
+    fi
+
     # Check for a bug in gcc's windres that causes the
     # compile to fail when a Windows native path is
     # passed into windres. The mingw toolchain requires
@@ -1522,9 +1286,9 @@ fi
 	echo "END" >> $conftest
 
 	echo $ac_n "checking for Windows native path bug in windres""... $ac_c" 1>&6
-echo "configure:1526: checking for Windows native path bug in windres" >&5
+echo "configure:1290: checking for Windows native path bug in windres" >&5
 	cyg_conftest=`$CYGPATH $conftest`
-	if { ac_try='$RC -o conftest.res.o $cyg_conftest'; { (eval echo configure:1528: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; } ; then
+	if { ac_try='$RC -o conftest.res.o $cyg_conftest'; { (eval echo configure:1292: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; } ; then
 	    echo "$ac_t""no" 1>&6
 	else
 	    echo "$ac_t""yes" 1>&6
@@ -1534,7 +1298,7 @@ echo "configure:1526: checking for Windows native path bug in windres" >&5
 	cyg_conftest=
     fi
 
-    if test "$CYGPATH" = "echo" || test "$ac_cv_cygwin" = "yes"; then
+    if test "$CYGPATH" = "echo"; then
         DEPARG='"$<"'
     else
         DEPARG='"$(shell $(CYGPATH) $<)"'
@@ -1542,8 +1306,45 @@ echo "configure:1526: checking for Windows native path bug in windres" >&5
 
     # set various compiler flags depending on whether we are using gcc or cl
 
+    if test "${GCC}" = "yes" ; then
+	echo $ac_n "checking for mingw32 version of gcc""... $ac_c" 1>&6
+echo "configure:1312: checking for mingw32 version of gcc" >&5
+if eval "test \"`echo '$''{'ac_cv_win32'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.$ac_ext <<EOF
+#line 1317 "configure"
+#include "confdefs.h"
+
+		#ifdef __WIN32__
+		    #error win32
+		#endif
+	    
+int main() {
+
+; return 0; }
+EOF
+if { (eval echo configure:1328: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+  rm -rf conftest*
+  ac_cv_win32=no
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  ac_cv_win32=yes
+fi
+rm -f conftest*
+	
+fi
+
+echo "$ac_t""$ac_cv_win32" 1>&6
+	if test "$ac_cv_win32" != "yes"; then
+	    { echo "configure: error: ${CC} cannot produce win32 executables." 1>&2; exit 1; }
+	fi
+    fi
+
     echo $ac_n "checking compiler flags""... $ac_c" 1>&6
-echo "configure:1547: checking compiler flags" >&5
+echo "configure:1348: checking compiler flags" >&5
     if test "${GCC}" = "yes" ; then
 	SHLIB_LD=""
 	SHLIB_LD_LIBS=""
@@ -1563,25 +1364,6 @@ echo "configure:1547: checking compiler flags" >&5
 	extra_cflags="-pipe"
 	extra_ldflags="-pipe"
 
-	if test "$ac_cv_cygwin" = "yes"; then
-	    case "$do64bit" in
-		amd64|x64|yes)
-		    CC="x86_64-w64-mingw32-gcc"
-		    LD="x86_64-w64-mingw32-ld"
-		    AR="x86_64-w64-mingw32-ar"
-		    RANLIB="x86_64-w64-mingw32-ranlib"
-		    RC="x86_64-w64-mingw32-windres"
-		;;
-		*)
-		    CC="i686-w64-mingw32-gcc"
-		    LD="i686-w64-mingw32-ld"
-		    AR="i686-w64-mingw32-ar"
-		    RANLIB="i686-w64-mingw32-ranlib"
-		    RC="i686-w64-mingw32-windres"
-	    ;;
-	esac
-	fi
-
 	if test "${SHARED_BUILD}" = "0" ; then
 	    # static
             echo "$ac_t""using static flags" 1>&6
@@ -1661,18 +1443,18 @@ echo "configure:1547: checking compiler flags" >&5
 		;;
 	    *)
 		cat > conftest.$ac_ext <<EOF
-#line 1665 "configure"
+#line 1447 "configure"
 #include "confdefs.h"
 
-			#ifdef _WIN64
+		    #ifdef _WIN64
 			#error 64-bit
-			#endif
+		    #endif
 		
 int main() {
 
 ; return 0; }
 EOF
-if { (eval echo configure:1676: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:1458: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   tcl_win_64bit=no
 else
@@ -1910,6 +1692,193 @@ EOF
 	fi
     fi
 
+    if test "${GCC}" = "yes" ; then
+	echo $ac_n "checking for SEH support in compiler""... $ac_c" 1>&6
+echo "configure:1698: checking for SEH support in compiler" >&5
+if eval "test \"`echo '$''{'tcl_cv_seh'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  if test "$cross_compiling" = yes; then
+  tcl_cv_seh=no
+else
+  cat > conftest.$ac_ext <<EOF
+#line 1706 "configure"
+#include "confdefs.h"
+
+	    #define WIN32_LEAN_AND_MEAN
+	    #include <windows.h>
+	    #undef WIN32_LEAN_AND_MEAN
+
+	    int main(int argc, char** argv) {
+		int a, b = 0;
+		__try {
+		    a = 666 / b;
+		}
+		__except (EXCEPTION_EXECUTE_HANDLER) {
+		    return 0;
+		}
+		return 1;
+	    }
+	
+EOF
+if { (eval echo configure:1725: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+then
+  tcl_cv_seh=yes
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -fr conftest*
+  tcl_cv_seh=no
+fi
+rm -fr conftest*
+fi
+
+	
+fi
+
+echo "$ac_t""$tcl_cv_seh" 1>&6
+	if test "$tcl_cv_seh" = "no" ; then
+	    cat >> confdefs.h <<\EOF
+#define HAVE_NO_SEH 1
+EOF
+
+	fi
+
+	#
+	# Check to see if the excpt.h include file provided contains the
+	# definition for EXCEPTION_DISPOSITION; if not, which is the case
+	# with Cygwin's version as of 2002-04-10, define it to be int,
+	# sufficient for getting the current code to work.
+	#
+	echo $ac_n "checking for EXCEPTION_DISPOSITION support in include files""... $ac_c" 1>&6
+echo "configure:1755: checking for EXCEPTION_DISPOSITION support in include files" >&5
+if eval "test \"`echo '$''{'tcl_cv_eh_disposition'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.$ac_ext <<EOF
+#line 1760 "configure"
+#include "confdefs.h"
+
+#	    define WIN32_LEAN_AND_MEAN
+#	    include <windows.h>
+#	    undef WIN32_LEAN_AND_MEAN
+	    
+int main() {
+
+		EXCEPTION_DISPOSITION x;
+	    
+; return 0; }
+EOF
+if { (eval echo configure:1773: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+  rm -rf conftest*
+  tcl_cv_eh_disposition=yes
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  tcl_cv_eh_disposition=no
+fi
+rm -f conftest*
+	
+fi
+
+echo "$ac_t""$tcl_cv_eh_disposition" 1>&6
+	if test "$tcl_cv_eh_disposition" = "no" ; then
+	cat >> confdefs.h <<\EOF
+#define EXCEPTION_DISPOSITION int
+EOF
+
+	fi
+
+	# Check to see if winnt.h defines CHAR, SHORT, and LONG
+	# even if VOID has already been #defined. The win32api
+	# used by mingw and cygwin is known to do this.
+
+	echo $ac_n "checking for winnt.h that ignores VOID define""... $ac_c" 1>&6
+echo "configure:1799: checking for winnt.h that ignores VOID define" >&5
+if eval "test \"`echo '$''{'tcl_cv_winnt_ignore_void'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.$ac_ext <<EOF
+#line 1804 "configure"
+#include "confdefs.h"
+
+		#define VOID void
+		#define WIN32_LEAN_AND_MEAN
+		#include <windows.h>
+		#undef WIN32_LEAN_AND_MEAN
+	    
+int main() {
+
+		CHAR c;
+		SHORT s;
+		LONG l;
+	    
+; return 0; }
+EOF
+if { (eval echo configure:1820: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+  rm -rf conftest*
+  tcl_cv_winnt_ignore_void=yes
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  tcl_cv_winnt_ignore_void=no
+fi
+rm -f conftest*
+	
+fi
+
+echo "$ac_t""$tcl_cv_winnt_ignore_void" 1>&6
+	if test "$tcl_cv_winnt_ignore_void" = "yes" ; then
+	    cat >> confdefs.h <<\EOF
+#define HAVE_WINNT_IGNORE_VOID 1
+EOF
+
+	fi
+
+	# See if the compiler supports casting to a union type.
+	# This is used to stop gcc from printing a compiler
+	# warning when initializing a union member.
+
+	echo $ac_n "checking for cast to union support""... $ac_c" 1>&6
+echo "configure:1846: checking for cast to union support" >&5
+if eval "test \"`echo '$''{'tcl_cv_cast_to_union'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.$ac_ext <<EOF
+#line 1851 "configure"
+#include "confdefs.h"
+
+int main() {
+
+		  union foo { int i; double d; };
+		  union foo f = (union foo) (int) 0;
+	    
+; return 0; }
+EOF
+if { (eval echo configure:1861: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+  rm -rf conftest*
+  tcl_cv_cast_to_union=yes
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  tcl_cv_cast_to_union=no
+fi
+rm -f conftest*
+	
+fi
+
+echo "$ac_t""$tcl_cv_cast_to_union" 1>&6
+	if test "$tcl_cv_cast_to_union" = "yes"; then
+	    cat >> confdefs.h <<\EOF
+#define HAVE_CAST_TO_UNION 1
+EOF
+
+	fi
+    fi
+
     # DL_LIBS is empty, but then we match the Unix version
     
     
@@ -1918,6 +1887,108 @@ EOF
 
 
 #--------------------------------------------------------------------
+# Perform additinal compiler tests.
+#--------------------------------------------------------------------
+
+if test "${GCC}" = "yes" ; then
+# Check to see if the winsock2.h include file provided contains
+# typedefs like LPFN_ACCEPT and friends.
+#
+echo $ac_n "checking for LPFN_ACCEPT support in winsock2.h""... $ac_c" 1>&6
+echo "configure:1899: checking for LPFN_ACCEPT support in winsock2.h" >&5
+if eval "test \"`echo '$''{'tcl_cv_lpfn_decls'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.$ac_ext <<EOF
+#line 1904 "configure"
+#include "confdefs.h"
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#undef WIN32_LEAN_AND_MEAN
+#include <winsock2.h>
+
+int main() {
+
+  LPFN_ACCEPT accept;
+
+; return 0; }
+EOF
+if { (eval echo configure:1918: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+  rm -rf conftest*
+  tcl_cv_lpfn_decls=yes
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  tcl_cv_lpfn_decls=no
+fi
+rm -f conftest*
+
+fi
+
+echo "$ac_t""$tcl_cv_lpfn_decls" 1>&6
+if test "$tcl_cv_lpfn_decls" = "no" ; then
+    cat >> confdefs.h <<\EOF
+#define HAVE_NO_LPFN_DECLS 1
+EOF
+
+fi
+
+# Check to see if malloc.h is missing the alloca function
+# declaration. This is known to be a problem with Mingw.
+# If we compiled without the function declaration, it
+# would work but we would get a warning message from gcc.
+# If we add the function declaration ourselves, it
+# would not compile correctly because the _alloca
+# function expects the argument to be passed in a
+# register and not on the stack. Instead, we just
+# call it from inline asm code.
+
+echo $ac_n "checking for alloca declaration in malloc.h""... $ac_c" 1>&6
+echo "configure:1950: checking for alloca declaration in malloc.h" >&5
+if eval "test \"`echo '$''{'tcl_cv_malloc_decl_alloca'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.$ac_ext <<EOF
+#line 1955 "configure"
+#include "confdefs.h"
+
+#include <malloc.h>
+
+int main() {
+
+  size_t arg = 0;
+  void* ptr;
+  ptr = alloca;
+  ptr = alloca(arg);
+
+; return 0; }
+EOF
+if { (eval echo configure:1969: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+  rm -rf conftest*
+  tcl_cv_malloc_decl_alloca=yes
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  tcl_cv_malloc_decl_alloca=no
+fi
+rm -f conftest*
+
+fi
+
+echo "$ac_t""$tcl_cv_malloc_decl_alloca" 1>&6
+if test "$tcl_cv_malloc_decl_alloca" = "no" &&
+   test "${GCC}" = "yes" ; then
+    cat >> confdefs.h <<\EOF
+#define HAVE_ALLOCA_GCC_INLINE 1
+EOF
+
+fi
+fi
+
+#--------------------------------------------------------------------
 # Set the default compiler switches based on the --enable-symbols
 # option.  This macro depends on C flags, and should be called
 # after SC_CONFIG_CFLAGS macro is called.
@@ -1925,7 +1996,7 @@ EOF
 
 
     echo $ac_n "checking for build with symbols""... $ac_c" 1>&6
-echo "configure:1929: checking for build with symbols" >&5
+echo "configure:2000: checking for build with symbols" >&5
     # Check whether --enable-symbols or --disable-symbols was given.
 if test "${enable_symbols+set}" = set; then
   enableval="$enable_symbols"
@@ -1985,7 +2056,7 @@ TCL_DBGX=${DBGX}
 #--------------------------------------------------------------------
 
 echo $ac_n "checking how to run the C preprocessor""... $ac_c" 1>&6
-echo "configure:1989: checking how to run the C preprocessor" >&5
+echo "configure:2060: checking how to run the C preprocessor" >&5
 # On Suns, sometimes $CPP names a directory.
 if test -n "$CPP" && test -d "$CPP"; then
   CPP=
@@ -2000,13 +2071,13 @@ else
   # On the NeXT, cc -E runs the code through the compiler's parser,
   # not just through cpp.
   cat > conftest.$ac_ext <<EOF
-#line 2004 "configure"
+#line 2075 "configure"
 #include "confdefs.h"
 #include <assert.h>
 Syntax Error
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:2010: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:2081: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   :
@@ -2017,13 +2088,13 @@ else
   rm -rf conftest*
   CPP="${CC-cc} -E -traditional-cpp"
   cat > conftest.$ac_ext <<EOF
-#line 2021 "configure"
+#line 2092 "configure"
 #include "confdefs.h"
 #include <assert.h>
 Syntax Error
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:2027: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:2098: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   :
@@ -2034,13 +2105,13 @@ else
   rm -rf conftest*
   CPP="${CC-cc} -nologo -E"
   cat > conftest.$ac_ext <<EOF
-#line 2038 "configure"
+#line 2109 "configure"
 #include "confdefs.h"
 #include <assert.h>
 Syntax Error
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:2044: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:2115: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   :
@@ -2066,17 +2137,17 @@ echo "$ac_t""$CPP" 1>&6
 
 ac_safe=`echo "errno.h" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for errno.h""... $ac_c" 1>&6
-echo "configure:2070: checking for errno.h" >&5
+echo "configure:2141: checking for errno.h" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2075 "configure"
+#line 2146 "configure"
 #include "confdefs.h"
 #include <errno.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:2080: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:2151: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
diff --git a/win/configure.in b/win/configure.in
index 5d7bcf7..f839521 100644
--- a/win/configure.in
+++ b/win/configure.in
@@ -80,63 +80,38 @@ fi
 AC_PROG_MAKE_SET
 
 #--------------------------------------------------------------------
-# Perform additinal compiler tests.
+# Determines the correct binary file extension (.o, .obj, .exe etc.)
 #--------------------------------------------------------------------
 
-AC_CYGWIN
+AC_OBJEXT
+AC_EXEEXT
 
-AC_CACHE_CHECK(for SEH support in compiler,
-    tcl_cv_seh,
-AC_TRY_RUN([
-#define WIN32_LEAN_AND_MEAN
-#include <windows.h>
-#undef WIN32_LEAN_AND_MEAN
+#--------------------------------------------------------------------
+# Check whether --enable-threads or --disable-threads was given.
+#--------------------------------------------------------------------
 
-int main(int argc, char** argv) {
-    int a, b = 0;
-    __try {
-        a = 666 / b;
-    }
-    __except (EXCEPTION_EXECUTE_HANDLER) {
-        return 0;
-    }
-    return 1;
-}
-],
-        tcl_cv_seh=yes,
-        tcl_cv_seh=no,
-        tcl_cv_seh=no)
-)
-if test "$tcl_cv_seh" = "no" ; then
-    AC_DEFINE(HAVE_NO_SEH, 1,
-            [Defined when mingw does not support SEH])
-fi
+SC_ENABLE_THREADS
 
-#
-# Check to see if the excpt.h include file provided contains the
-# definition for EXCEPTION_DISPOSITION; if not, which is the case
-# with Cygwin's version as of 2002-04-10, define it to be int,
-# sufficient for getting the current code to work.
-#
-AC_CACHE_CHECK(for EXCEPTION_DISPOSITION support in include files,
-    tcl_cv_eh_disposition,
-AC_TRY_COMPILE([
-#define WIN32_LEAN_AND_MEAN
-#include <windows.h>
-#undef WIN32_LEAN_AND_MEAN
-],
-[
-  EXCEPTION_DISPOSITION x;
-],
-        tcl_cv_eh_disposition=yes,
-        tcl_cv_eh_disposition=no)
-)
-if test "$tcl_cv_eh_disposition" = "no" ; then
-    AC_DEFINE(EXCEPTION_DISPOSITION, int,
-            [Defined when cygwin/mingw does not support EXCEPTION DISPOSITION])
-fi
+#--------------------------------------------------------------------
+# The statements below define a collection of symbols related to
+# building libtcl as a shared library instead of a static library.
+#--------------------------------------------------------------------
+
+SC_ENABLE_SHARED
+
+#--------------------------------------------------------------------
+# The statements below define a collection of compile flags.  This
+# macro depends on the value of SHARED_BUILD, and should be called
+# after SC_ENABLE_SHARED checks the configure switches.
+#--------------------------------------------------------------------
 
+SC_CONFIG_CFLAGS
 
+#--------------------------------------------------------------------
+# Perform additinal compiler tests.
+#--------------------------------------------------------------------
+
+if test "${GCC}" = "yes" ; then
 # Check to see if the winsock2.h include file provided contains
 # typedefs like LPFN_ACCEPT and friends.
 #
@@ -159,31 +134,6 @@ if test "$tcl_cv_lpfn_decls" = "no" ; then
             [Defined when cygwin/mingw does not support LPFN_ACCEPT and friends.])
 fi
 
-# Check to see if winnt.h defines CHAR, SHORT, and LONG
-# even if VOID has already been #defined. The win32api
-# used by mingw and cygwin is known to do this.
-
-AC_CACHE_CHECK(for winnt.h that ignores VOID define,
-    tcl_cv_winnt_ignore_void,
-AC_TRY_COMPILE([
-#define VOID void
-#define WIN32_LEAN_AND_MEAN
-#include <windows.h>
-#undef WIN32_LEAN_AND_MEAN
-],
-[
-  CHAR c;
-  SHORT s;
-  LONG l;
-],
-        tcl_cv_winnt_ignore_void=yes,
-        tcl_cv_winnt_ignore_void=no)
-)
-if test "$tcl_cv_winnt_ignore_void" = "yes" ; then
-    AC_DEFINE(HAVE_WINNT_IGNORE_VOID, 1,
-            [Defined when cygwin/mingw ignores VOID define in winnt.h])
-fi
-
 # Check to see if malloc.h is missing the alloca function
 # declaration. This is known to be a problem with Mingw.
 # If we compiled without the function declaration, it
@@ -213,55 +163,9 @@ if test "$tcl_cv_malloc_decl_alloca" = "no" &&
     AC_DEFINE(HAVE_ALLOCA_GCC_INLINE, 1,
             [Defined when gcc should use inline ASM to call alloca.])
 fi
-
-# See if the compiler supports casting to a union type.
-# This is used to stop gcc from printing a compiler
-# warning when initializing a union member.
-
-AC_CACHE_CHECK(for cast to union support,
-    tcl_cv_cast_to_union,
-AC_TRY_COMPILE([],
-[
-  union foo { int i; double d; };
-  union foo f = (union foo) (int) 0;
-],
-        tcl_cv_cast_to_union=yes,
-        tcl_cv_cast_to_union=no)
-)
-if test "$tcl_cv_cast_to_union" = "yes"; then
-    AC_DEFINE(HAVE_CAST_TO_UNION, 1,
-            [Defined when compiler supports casting to union type.])
 fi
 
 #--------------------------------------------------------------------
-# Determines the correct binary file extension (.o, .obj, .exe etc.)
-#--------------------------------------------------------------------
-
-AC_OBJEXT
-AC_EXEEXT
-
-#--------------------------------------------------------------------
-# Check whether --enable-threads or --disable-threads was given.
-#--------------------------------------------------------------------
-
-SC_ENABLE_THREADS
-
-#--------------------------------------------------------------------
-# The statements below define a collection of symbols related to
-# building libtcl as a shared library instead of a static library.
-#--------------------------------------------------------------------
-
-SC_ENABLE_SHARED
-
-#--------------------------------------------------------------------
-# The statements below define a collection of compile flags.  This
-# macro depends on the value of SHARED_BUILD, and should be called
-# after SC_ENABLE_SHARED checks the configure switches.
-#--------------------------------------------------------------------
-
-SC_CONFIG_CFLAGS
-
-#--------------------------------------------------------------------
 # Set the default compiler switches based on the --enable-symbols
 # option.  This macro depends on C flags, and should be called
 # after SC_CONFIG_CFLAGS macro is called.
diff --git a/win/tcl.m4 b/win/tcl.m4
index 4761941..e06b1e0 100644
--- a/win/tcl.m4
+++ b/win/tcl.m4
@@ -408,6 +408,36 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
     # which requires x86|amd64|ia64.
     MACHINE="X86"
 
+    AC_CACHE_CHECK(for cross-compile version of gcc,
+	ac_cv_cross,
+	AC_TRY_COMPILE([
+	    #ifdef __WIN32__
+		#error cross-compiler
+	    #endif
+	], [],
+	ac_cv_cross=yes,
+	ac_cv_cross=no)
+    )
+
+    if test "$ac_cv_cross" = "yes"; then
+	case "$do64bit" in
+	    amd64|x64|yes)
+		CC="x86_64-w64-mingw32-gcc"
+		LD="x86_64-w64-mingw32-ld"
+		AR="x86_64-w64-mingw32-ar"
+		RANLIB="x86_64-w64-mingw32-ranlib"
+		RC="x86_64-w64-mingw32-windres"
+	    ;;
+	    *)
+		CC="i686-w64-mingw32-gcc"
+		LD="i686-w64-mingw32-ld"
+		AR="i686-w64-mingw32-ar"
+		RANLIB="i686-w64-mingw32-ranlib"
+		RC="i686-w64-mingw32-windres"
+	    ;;
+	esac
+    fi
+
     # Check for a bug in gcc's windres that causes the
     # compile to fail when a Windows native path is
     # passed into windres. The mingw toolchain requires
@@ -433,7 +463,7 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 	cyg_conftest=
     fi
 
-    if test "$CYGPATH" = "echo" || test "$ac_cv_cygwin" = "yes"; then
+    if test "$CYGPATH" = "echo"; then
         DEPARG='"$<"'
     else
         DEPARG='"$(shell $(CYGPATH) $<)"'
@@ -441,6 +471,22 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 
     # set various compiler flags depending on whether we are using gcc or cl
 
+    if test "${GCC}" = "yes" ; then
+	AC_CACHE_CHECK(for mingw32 version of gcc,
+	    ac_cv_win32,
+	    AC_TRY_COMPILE([
+		#ifdef __WIN32__
+		    #error win32
+		#endif
+	    ], [],
+	    ac_cv_win32=no,
+	    ac_cv_win32=yes)
+	)
+	if test "$ac_cv_win32" != "yes"; then
+	    AC_MSG_ERROR([${CC} cannot produce win32 executables.])
+	fi
+    fi
+
     AC_MSG_CHECKING([compiler flags])
     if test "${GCC}" = "yes" ; then
 	SHLIB_LD=""
@@ -461,25 +507,6 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 	extra_cflags="-pipe"
 	extra_ldflags="-pipe"
 
-	if test "$ac_cv_cygwin" = "yes"; then
-	    case "$do64bit" in
-		amd64|x64|yes)
-		    CC="x86_64-w64-mingw32-gcc"
-		    LD="x86_64-w64-mingw32-ld"
-		    AR="x86_64-w64-mingw32-ar"
-		    RANLIB="x86_64-w64-mingw32-ranlib"
-		    RC="x86_64-w64-mingw32-windres"
-		;;
-		*)
-		    CC="i686-w64-mingw32-gcc"
-		    LD="i686-w64-mingw32-ld"
-		    AR="i686-w64-mingw32-ar"
-		    RANLIB="i686-w64-mingw32-ranlib"
-		    RC="i686-w64-mingw32-windres"
-	    ;;
-	esac
-	fi
-
 	if test "${SHARED_BUILD}" = "0" ; then
 	    # static
             AC_MSG_RESULT([using static flags])
@@ -559,9 +586,9 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 		;;
 	    *)
 		AC_TRY_COMPILE([
-			#ifdef _WIN64
+		    #ifdef _WIN64
 			#error 64-bit
-			#endif
+		    #endif
 		], [],
 			tcl_win_64bit=no,
 			tcl_win_64bit=yes
@@ -784,6 +811,101 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 	fi
     fi
 
+    if test "${GCC}" = "yes" ; then
+	AC_CACHE_CHECK(for SEH support in compiler,
+	    tcl_cv_seh,
+	AC_TRY_RUN([
+	    #define WIN32_LEAN_AND_MEAN
+	    #include <windows.h>
+	    #undef WIN32_LEAN_AND_MEAN
+
+	    int main(int argc, char** argv) {
+		int a, b = 0;
+		__try {
+		    a = 666 / b;
+		}
+		__except (EXCEPTION_EXECUTE_HANDLER) {
+		    return 0;
+		}
+		return 1;
+	    }
+	],
+	    tcl_cv_seh=yes,
+	    tcl_cv_seh=no,
+	    tcl_cv_seh=no)
+	)
+	if test "$tcl_cv_seh" = "no" ; then
+	    AC_DEFINE(HAVE_NO_SEH, 1,
+		    [Defined when mingw does not support SEH])
+	fi
+
+	#
+	# Check to see if the excpt.h include file provided contains the
+	# definition for EXCEPTION_DISPOSITION; if not, which is the case
+	# with Cygwin's version as of 2002-04-10, define it to be int,
+	# sufficient for getting the current code to work.
+	#
+	AC_CACHE_CHECK(for EXCEPTION_DISPOSITION support in include files,
+	    tcl_cv_eh_disposition,
+	    AC_TRY_COMPILE([
+#	    define WIN32_LEAN_AND_MEAN
+#	    include <windows.h>
+#	    undef WIN32_LEAN_AND_MEAN
+	    ],[
+		EXCEPTION_DISPOSITION x;
+	    ],
+		tcl_cv_eh_disposition=yes,
+		tcl_cv_eh_disposition=no)
+	)
+	if test "$tcl_cv_eh_disposition" = "no" ; then
+	AC_DEFINE(EXCEPTION_DISPOSITION, int,
+		[Defined when cygwin/mingw does not support EXCEPTION DISPOSITION])
+	fi
+
+	# Check to see if winnt.h defines CHAR, SHORT, and LONG
+	# even if VOID has already been #defined. The win32api
+	# used by mingw and cygwin is known to do this.
+
+	AC_CACHE_CHECK(for winnt.h that ignores VOID define,
+	    tcl_cv_winnt_ignore_void,
+	    AC_TRY_COMPILE([
+		#define VOID void
+		#define WIN32_LEAN_AND_MEAN
+		#include <windows.h>
+		#undef WIN32_LEAN_AND_MEAN
+	    ], [
+		CHAR c;
+		SHORT s;
+		LONG l;
+	    ],
+        tcl_cv_winnt_ignore_void=yes,
+        tcl_cv_winnt_ignore_void=no)
+	)
+	if test "$tcl_cv_winnt_ignore_void" = "yes" ; then
+	    AC_DEFINE(HAVE_WINNT_IGNORE_VOID, 1,
+		    [Defined when cygwin/mingw ignores VOID define in winnt.h])
+	fi
+
+	# See if the compiler supports casting to a union type.
+	# This is used to stop gcc from printing a compiler
+	# warning when initializing a union member.
+
+	AC_CACHE_CHECK(for cast to union support,
+	    tcl_cv_cast_to_union,
+	    AC_TRY_COMPILE([],
+	    [
+		  union foo { int i; double d; };
+		  union foo f = (union foo) (int) 0;
+	    ],
+	    tcl_cv_cast_to_union=yes,
+	    tcl_cv_cast_to_union=no)
+	)
+	if test "$tcl_cv_cast_to_union" = "yes"; then
+	    AC_DEFINE(HAVE_CAST_TO_UNION, 1,
+		    [Defined when compiler supports casting to union type.])
+	fi
+    fi
+
     # DL_LIBS is empty, but then we match the Unix version
     AC_SUBST(DL_LIBS)
     AC_SUBST(CFLAGS_DEBUG)